Urokinase receptor. An activation antigen in human T lymphocytes
| Autor: | Anders Nykjaer, Bjarne Kuno Møller, Todd, R. F., Tove Christensen, Peter Andreasen, Gliemann, J., Petersen, C. M. |
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| Rok vydání: | 1994 |
| Předmět: |
Base Sequence
Antigens CD27 Interleukin-7 Molecular Sequence Data Immunology Receptors Antigen T-Cell Gene Expression Receptors Cell Surface Lymphocyte Activation Receptors Urokinase Plasminogen Activator T-Lymphocyte Subsets Transforming Growth Factor beta Phorbol Esters Humans Interleukin-2 Immunology and Allergy Interleukin-4 RNA Messenger DNA Primers |
| Zdroj: | Nykjaer, A, Møller, B K, Todd, R F, Christensen, T, Andreasen, P, Gliemann, J & Petersen, C M 1994, ' Urokinase receptor. An activation antigen in human T lymphocytes ', Journal of Immunology, vol. 152, no. 2, pp. 505-16 . Aarhus University |
| ISSN: | 1550-6606 0022-1767 |
| DOI: | 10.4049/jimmunol.152.2.505 |
| Popis: | The ability of activated T lymphocytes to extravasate and reach inflammatory and malignant foci in the tissues is a basic function of cellular immunity. Recent evidence strongly suggests that the urokinase receptor (uPAR) holds a central position in the development of human two-chain urokinase-mediated pericellular proteolysis and matrix degradation, an important element in cell migration. In this report we establish uPAR as a pan T cell activation Ag. As determined by FACS analysis, CD3+ lymphocytes from healthy donors exhibited no significant uPAR expression. In contrast, patients (e.g., HIV-positive donors) showed distinct uPAR expression, confined to HLA-DR+ cells, in up to 80% of all T cells. In vitro activation by PMA caused a rapid up-regulation of membrane uPAR in all healthy donor T cells and was accompanied by enhanced receptor synthesis and elevated uPAR mRNA levels. A similar induction resulted from activation via the TCR/CD3 complex using mitogens (PHA, and Con A), anti-CD3 antibodies, and alloantigen. Receptor expression at single cell level was also modulated by a number of cytokines. IL-2, IL-4 and IL-7 increased uPAR presentation on 20 to 50% of the T cell population, and combined stimulation of bulk cultures demonstrated an additive effect of IL-2 and IL-7, whereas the response to each of the two was inhibited by IL-4. In addition, TGF-beta 1 substantially reduced the uPAR expression in T cell cultures responding to PHA, IL-2, and IL-7. Irrespective of the activating reagent, the T cells appeared to produce the same molecular uPAR species, but the affinity of uPAR expressed in PMA blasts was decreased, presumably because of a differential location at the cell surface. All activated cultures showed co-expression of uPAR and CD25. The finding that the urokinase receptor is an activation Ag may suggest that cell-associated plasminogen activation is involved in extravasation and migration of activated T cells. |
| Databáze: | OpenAIRE |
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